Small tweaks and fixes

src/inode/file.zig

@@ -15,12 +15,12 @@ pub const FileInode = struct {
     blocks: []const BlockSize,
 
     pub fn init(alloc: std.mem.Allocator, rdr: io.AnyReader, block_size: u32) !FileInode {
-        var fixed_buf = [_]u8{0} ** 16;
-        _ = try rdr.readAll(@ptrCast(&fixed_buf));
+        const fixed_buf = [16]u8{};
+        _ = try rdr.readAll(&fixed_buf);
         const frag_idx = std.mem.bytesToValue(u32, fixed_buf[4..8]);
         const size = std.mem.bytesToValue(u32, fixed_buf[12..16]);
         var block_num = size / block_size;
-        if (frag_idx != 0xFFFFFFFF) {
+        if (frag_idx == 0xFFFFFFFF and size % block_size > 0) {
             block_num += 1;
         }
         const blocks = try alloc.alloc(BlockSize, block_num);
@@ -49,12 +49,12 @@ pub const ExtFileInode = struct {
     blocks: []const BlockSize,
 
     pub fn init(alloc: std.mem.Allocator, rdr: io.AnyReader, block_size: u32) !ExtFileInode {
-        var fixed_buf = [_]u8{0} ** 40;
+        var fixed_buf = [40]u8{};
         _ = try rdr.readAll(&fixed_buf);
         const size = std.mem.bytesToValue(u64, fixed_buf[8..16]);
         const frag_idx = std.mem.bytesToValue(u32, fixed_buf[28..32]);
         var block_num = size / block_size;
-        if (frag_idx != 0xFFFFFFFF) {
+        if (frag_idx == 0xFFFFFFFF and size % block_size > 0) {
             block_num += 1;
         }
         const blocks = try alloc.alloc(BlockSize, block_num);